Future Works Radio Resource Measurement and Link Quality Analysis of 802.11 Methodology and Application Ma Yongsen Weekly Meeting, June 18, 2012 Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works Outline 1 PHY and MAC Amendments of IEEE 802.11 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction 2 Application-oriented, Measurement-based Modeling 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction Outline 1 PHY and MAC Amendments of IEEE 802.11 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction 2 Application-oriented, Measurement-based Modeling 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction Wireless LAN Radio Measurements General Description Enable STAs to observe and gather data on the radio environment and radio link performance. Provide standard measurements across vendors, and resulting data to upper layers in the communications stack. The first step in making WLAN smart and capable of making adjustment of STA operation to better suit the radio environment, including measurements that extends the capability, reliability, and maintainability of WLANs. Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction Wireless LAN Radio Measurements General Description Collect pre-information to address the mobility and dynamic requirements of technologies, which can drastically improve networks’ performance. Provide quantifiable radio environment measurements to attain the necessary performance levels, including video over IP, location based applications , and applications requiring mitigation of harsh radio environments. Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction Wireless LAN Radio Measurements General Description A STA may choose to make measurements locally, request a measurement from another STA, or may be requested by another STA to make one or more measurements and return the results. STAs (either in the APs or in the individual devices) can make intelligent decisions about the most effective way to utilize the available spectrum, power, and bandwidth for its desired communications. Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction Wireless LAN Radio Measurements Measurements Information The Radio Measurement Service provides the following: Request/Report measurements in supported channels. Perform radio measurements in supported channels. Interface for upper layer applications. Information about neighbor APs. The Request-only mechanism is: Measurement Pause The Report-only mechanism is: Measurement Pilot Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction Wireless LAN Radio Measurements Measurements Information The Radio Measurement Service provides the following: Request/Report measurements in supported channels. Perform radio measurements in supported channels. Interface for upper layer applications. Information about neighbor APs. The Request-only mechanism is: Measurement Pause The Report-only mechanism is: Measurement Pilot Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction Wireless LAN Radio Measurements Measurements Information The Request/Report measurements are: Beacon Frame Channel Load Noise Histogram STA Statistics Location Configuration Information (LCI) Neighbor Report Link Measurement Transmit Stream/Category Measurement Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction Outline 1 PHY and MAC Amendments of IEEE 802.11 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction 2 Application-oriented, Measurement-based Modeling 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction Hibrid Coordination Function of MAC Layer 1 Centralized Control Protocol Implemented by HCF Controlled Channel Access (HCCA), requiring a central coordination instance that schedules medium access. No device implemented HCCA now. 2 Distributed Control Protocol Enhanced Distributed Channel Access (EDCA) provides support for different traffic (voice, video, background, best effort) with different QoS needs. Both HCCA and EDCA change the medium sharing rules according to the actual frame transmission duration, bounded by the transmission opportunity limit. Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction Outline 1 PHY and MAC Amendments of IEEE 802.11 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction 2 Application-oriented, Measurement-based Modeling 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction Recommended Practice for Performance Tests 802.11.2 defines a set of measurement methodologies, test conditions, and performance metrics. Devices under test are evaluated in line-of-sight and non-line-of-sight, indoor and outdoor condictions. The measured metrics vary from overall results such as throughput, over related details such as adjacent channel interference, to packet loss and power consumption. Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction PHY and MAC amendments of IEEE 802.11 The key of 802.11 is its simple MAC operation, which is robust and adaptive to varying conditions, and covers most needs sufficiently well. The 802.11 continues to expand. 802.11k and 802.11v provide radio resource measurement and network management respectively. 802.11e and 802.11.2 give support for QoS and performance prediction. 802.11k is partially supported by venders, and 802.11e and 802.11.2 were dissolved and withdrawn. Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Outline 1 PHY and MAC Amendments of IEEE 802.11 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction 2 Application-oriented, Measurement-based Modeling 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling 802.11n Technology PHY Amendments Spatial Diversity Channelization MAC Amendments Frame Aggregation Streamlined ACK 802.11n incorporates several significant enhancements that can deliver five times or more throughput and more robust connections at up to twice the range over legacy technology. Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling 802.11n Technology PHY Amendments Spatial Diversity MAC spatial diversity to PHY spatial diversity to get higher data rates Space Time Block Coding (STBC) to improve robustness and expand coverage Channelization 20MHz or 40MHz channel bonding to choose appropriate data rate adaptively, increase data rate or reduce interference. Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling 802.11n Technology MAC Amendments: improve protocol efficiency and throughput Frame Aggregation: Reduce the transmit overhead Aggregated MAC Service Data Unit (A-MSDU): incerases the frame size; Aggregated MAC Protocol Data Unit (A-MPDU): increases the maximum size of frames from 2304 bytes to 64k bytes. Streamlined ACK: Reduce the ACK overhead Send a single block ACK frame to acknowledge several received frames, reduce the size of ACK frame from 128 bytes to 8 bytes. Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Outline 1 PHY and MAC Amendments of IEEE 802.11 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction 2 Application-oriented, Measurement-based Modeling 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Link Quality Characterization New Characteristics According to PHY and MAC Amendments PHY: More Complex Link Quality Modeling 1. Spatial Diversity and Channelization 2. Data Delivery Rate [1] MAC: Significant Influence on Packet Delivery Ratio 1. Frame and Packet Size 2. ACK mechanism [1] Experimental Characterization of 802.11n Link Quality at High Rates, WiNTECH’10, Pelechrinis, University of Pittsburgh Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Outline 1 PHY and MAC Amendments of IEEE 802.11 802.11k: Radio Resource Measurement 802.11e: Support for Quality of Service 802.11.2: Wireless Performance Prediction 2 Application-oriented, Measurement-based Modeling 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Linux Driver for Atheros 802.11n Driver Vendor AP IBSS Mesh Monitor PHY Buses ath9k Atheros yes yes yes yes a/b/g/n PCI/PCI-E/PCMCIA Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works 802.11n: Wide Coverage, High Throughput 802.11n: Link Quality Characterization Measurement-based Link Quality Modeling Measurement Methodology Active Measurement: Easy to be implemented Location Difference Multipath Effects Passive Measurement: Realtime Control Time Varying Traffic Congestion Measurement Procedure: Modify Linux wireless tools to get data (RSS, BER, PDR) and model (BER-RSS, PDR-RSS) Modify ath9k driver to implement active and passive measurement Modify MAC protocol to make online and passive monitor Ma Yongsen Radio Resource Measurement & Link Quality Analysis
Future Works Future Works Modify the codes of iwconfig and iwlist, make active measurement; Analysis the link quality according to different conditions; Exploit the ath9k driver to get the PDR, get the PDR-RSS model in the case of 802.11n; Passive and online measurement by modify ath9k. Ma Yongsen Radio Resource Measurement & Link Quality Analysis
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